Patents: Tamron 300mm f/2.8, 400mm f/4 and 500mm f/4 Lenses
It seems that Tamron is working on several fast super telephoto prime lenses. Recently Tamron has filed three new patents for Tamron 300mm f/2.8, 400mm f/4 and 500mm f/4 lenses, which are designed for a 35mm full-frame sensor. Take a look at the patent details below:
Embodiment 1: 300mm F/2.8
- Focal length: 304.799 mm
- F No.: 2.8
- ω: 3.997
- Image height: 21.64 mm
- Back focus: 70.1919 mm
- Lens length: 298.38 mm
Embodiment 2: 400mm F/4
- Focal length: 396.296 mm
- F No.: 4.0
- ω: 2.963
- Image height: 21.64 mm
- Back focus: 102.3549 mm
- Lens length: 332.36 mm
Embodiment 3: 500mm F/4
- Focal length: 485.045 mm
- F No.: 4.001
- ω: 2.530
- Image height: 21.64 mm
- Back focus: 125.2621 mm
- Lens length: 420.001 mm
Via: so-net